Here's a trick to get a large "sink" or dent out of a tractor gas tank, especially if you can't get it cleaned out by a radiator shop, or whatever. Clean the dent area down to bare metal. If possible, obtain several sticks of auto body shop lead, (used as a filling material, using a torch!) In this case, after you have the low spot very clean to bare metal, "tin" it with a large soldering iron--that funny looking thing hanging in Grand-paw's garage. you can heat the iron on the gas stove or some other way. Bend a stick of lead into a small circle with the ends sticking out a few inches, the short leg to go onto the tank. Clamp where the two sides of the stick of lead come together with Vise-Grips. Have a long bar of some sort, and a hammer and a block of 2x4. Using the heavy, old, antique soldering iron, (heated very hot) and holding one end of the lead stick, solder the end of the lead stick onto the lowest area of the dent! Make a big "mushroom" around the stick! When cool, leaving the Vise-grips on the rod, stick yer pry bar thru the loop, onto the piece of 2x4 set outside the perimeter of the dent, and pull it up, tapping down on the outside edges of the dent! Plumbers lead will not work in this case, because it has a different make-up than auto body lead!
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